I’ve moved to WordPress. This post can now be found at December 2009 SST Anomaly Update#############
NINO3.4 SST Anomalies Remained Well In Strong El Nino Territories, And Global SST Anomalies Have Responded To The Surge From Last Month.
MONTHLY SST ANOMALY MAP
The map of Global OI.v2 SST anomalies for December 2009 downloaded from the NOMADS website is shown below.
December 2009 SST Anomalies Map (Global SST Anomaly = +0.31 deg C)
Global SST anomalies rose a good amount (+0.052 deg C) between November and December, with the rise in the Southern Hemisphere (+0.086 deg C) significantly larger than the rise in the Northern Hemisphere (+0.008 deg C). The equatorial Pacific remains in strong El Nino conditions (Monthly NINO3.4 SST Anomaly = +1.82 deg C and Weekly NINO3.4 SST Anomaly = +1.76 deg C). Monthly NINO3.4 SST anomalies rose +0.15 in December, while the weekly data shows NINO3.4 SST anomalies have dropped from their peak over the past two weeks. (Does this mean NINO3.4 SST Anomalies have reached their peak for the season?)
Monthly Change = +0.052 deg C
NINO3.4 SST Anomaly
Monthly Change = +0.15 deg C
EAST INDIAN-WEST PACIFIC
As noted last month, I’ve added the East Indian-West Pacific SST Anomaly data well in advance of when any evidence of a step change would occur. (I’m trying to draw attention to the atypical response.) Using the 1986/87/88 and 1997/98 El Nino events as references, East Indian-West Pacific SST Anomalies peak about 7 to 9 months after the peak of the NINO3.4 SST anomalies, so we shouldn’t expect any visible sign of a step change for almost 18 to 24 months. We’ll just have to watch and see.
East Indian-West Pacific (60S-65N, 80E-180)
Monthly Change = -0.01 deg C
Further information on the upward “step changes” that result from strong El Nino events, refer to my posts from a year ago Can El Nino Events Explain All of the Global Warming Since 1976? – Part 1 and Can El Nino Events Explain All of the Global Warming Since 1976? – Part 2
NOTE ABOUT THE DATA
The MONTHLY graphs illustrate raw monthly OI.v2 SST anomaly data from November 1981 to December 2009.
MONTHLY INDIVIDUAL OCEAN AND HEMISPHERIC SST UPDATES
Monthly Change = +0.008 deg C
Monthly Change = +0.086 deg C
North Atlantic (0 to 75N, 78W to 10E)
Monthly Change = -0.025 deg C
South Atlantic (0 to 60S, 70W to 20E)
Monthly Change = +0.192 deg C
North Pacific (0 to 65N, 100 to 270E, where 270E=90W)
Monthly Change = +0.009 Deg C
South Pacific (0 to 60S, 145 to 290E, where 290E=70W)
Monthly Change = +0.116 deg C
Indian Ocean (30N to 60S, 20 to 145E)
Monthly Change = +0.030 deg C
Arctic Ocean (65 to 90N)
Monthly Change = -0.092 deg C
Southern Ocean (60 to 90S)
Monthly Change = +0.007 deg C
WEEKLY NINO3.4 SST ANOMALIES
The weekly NINO3.4 SST anomaly data illustrate OI.v2 data centered on Wednesdays. The latest weekly NINO3.4 SST anomalies are +1.76 deg C, down from a (seasonal?) peak of 1.94 Deg C two weeks ago.
Weekly NINO3.4 (5S-5N, 170W-120W)
The Optimally Interpolated Sea Surface Temperature Data (OISST) are available through the NOAA National Operational Model Archive & Distribution System (NOMADS).
That hotspot in the south pacific really is incredible.
Do you know if there are archived maps of the hotspot from the past few ninos? I saw the Trenberth aggregation, but just curious how this one matches up. I played around with the OIv2 maps without much luck.
Fascinating that the Nino is correlated with that location now.
Any thoughts on the high Dec S. Atlantic anomalies? I see the hotspot off S. America - just curious.
John: You asked, "Do you know if there are archived maps of the hotspot from the past few ninos?"
I've got two posts with them. One directly about the South Pacific hotspot:
The other indirectly about, but it covers the subject back to 1951:
You asked, "Any thoughts on the high Dec S. Atlantic anomalies?"
Not yet. What I find curious is this year's upward step in the South Atlantic time-series graph?
Post a Comment